There is also a command or SYS for deactivating the emulator as I see in the code, but I haven't figured it out due to time considerations yet. By the way the emulator has no monitor, so

SYS1024

does not bring a monitor program. If you issued this command and screen changed, you can restore it by typing

SYS49152

blindly.

As an idea, a boot block can be created to load and run this automatically in the Commodore 128. This boot block needs to load the emulator code, boot the C128 in C64 mode, configure the basic (without indirect jumping to ($A000)), and start the emulator. Also, the DOS wedge can be removed and a tiny monitor can be included for a better compatibility.